In The Question Below How Would You Resolve The Balance If You Consider Countercurre 2333295

in the question below how would you resolve the balance if you consider countercurrent

It is desired to reduce the pyridine concentration of 5000 kg/h of an aqueous solution from 50 to 5 wt% in a single batch extraction with pure chlorobenzene. What amount of solvent is required? Solve on righttriangular coordinates.